Eurocopter's X3 demonstrator

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After undergoing a planned upgrade to its gearbox that enabled it to operate at full engine power, Eurocopter's X3 hybrid helicopter demonstrator has surpassed its original speed target of 220 knots (407 km/h or 253 mph). In a flight on May 12, the X3 maintained a true airspeed of 232 knots (430 km/h or 267 mph) for several minutes during stable, level flight.